Aqueous median treating composition

Abstract

An aqueous treating coating composition suitable for coating a middle corrugated layer of a double-faced liner board, the composition comprising: (A) an emulsion of wax particles, and (B) a binder that is (1) an alkali metal alginate, or (2) a solvent soluble styrene/acrylic copolymer, or (3) a mixture of the styrene/acrylic copolymer with a water-soluble melamine/formaldehyde prepolymer.

What is claimed is: 
     
       1. A method of coating a surface of medium corrugated layer of a liner board to provide a water resistant coating, the method comprising the step of applying a thickness of about 0.1 to 10 mils of an aqueous coating composition to the corrugated layer, the composition comprising; (A) an emulsion of wax particles that is about 40 to 98% by weight of the composition, and   (B) a binder that is a solvent soluble styrene/acrylic copolymer.   
     
     
       2. The method of coating a surface of medium corrugated layer of a liner board of claim 1, wherein the binder is about 2% by weight to about 40% by weight of the composition. 
     
     
       3. The method of coating a surface of medium corrugated layer of a liner board of claim 1, wherein the emulsion is about 50% by weight to about 75% by weight of the composition and the binder is about 10% by weight to about 35% by weight of the composition. 
     
     
       4. The method of coating a surface of medium corrugated layer of a liner board of claim 1, wherein the emulsion is about 65% by weight to about 75% by weight of the composition and the binder is about 22% by weight to about 32% by weight of the composition.